36 Pound Fish
To catch a 36 pound fish, when your an adult go you the fishing pond at night and look for a school of snake-like fish, that looks kind of small (but they are not). It should be close to shore, use the sinking lure near the Bunch or snake-like fish and then they should all go after it if you throw it in the center, If you use the regular lure they will run away from it. Once you catch it, and bring it to the guy to weigh it. The guy will say "Wow!!! This fish is huge, But you can't keep it because it is endangered so you have to put it back."
From World-of-Nintendo